6631441387 has 2 divisors, whose sum is σ = 6631441388. Its totient is φ = 6631441386.

The previous prime is 6631441373. The next prime is 6631441391. The reversal of 6631441387 is 7831441366.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6631441387 is a prime.

It is not a weakly prime, because it can be changed into another prime (6631441357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3315720693 + 3315720694.

It is an arithmetic number, because the mean of its divisors is an integer number (3315720694).

Almost surely, 2^6631441387 is an apocalyptic number.

6631441387 is a deficient number, since it is larger than the sum of its proper divisors (1).

6631441387 is an equidigital number, since it uses as much as digits as its factorization.

6631441387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 43.

The square root of 6631441387 is about 81433.6624928537. The cubic root of 6631441387 is about 1878.7513765510.

It can be divided in two parts, 66314 and 41387, that added together give a palindrome (107701).

The spelling of 6631441387 in words is "six billion, six hundred thirty-one million, four hundred forty-one thousand, three hundred eighty-seven".